Answer:it was very effective.
Explanation:
According to report in America 1954, Salk conducted a national study, with over a million paediatric subjects wish yielded a positive outcome and on 12 April 1955, the vaccine was considered safe and efficacious. in 1955, the vaccines was used for over 29,000 cases of poliomyelitis in the US and the infection rate reduced to less than 6,000. This made Salk vaccine more recognized and it was speedily adopted worldwide reaching almost 90 countries in less than 2 years after it mass production.
Answer:
Mast cells and histamines
Explanation:
Mast cells release several chemicals like histamine, cytokines, and other compounds that dilate blood vessels in the affected area. During the inflammatory reaction, mast cells release substances such as histamine. Histamine is a vasodilator and dilates blood vessels and increases their permeability.
The increased permeability of vessels makes the tissue fluid leak from the vessel. The swelling in the area stimulates pain receptors. This is followed by the arrival of neutrophils and monocytes (which become macrophages) through the capillary wall and phagocytosis of pathogens.
Cyclobenzaprine is a drug that produce an anticholinergic response in the body, which means that is blocks neurotransmitters from the nervous system to prevent things like muscle spasms. but due to the neurotransmitters being blocked, it can cause these kinds of side effects because the brain can no longer control these things.
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Natural selection: organisms with certain inherited traits that are more likely to survive and reproduce than others.
These favorable traits can give an organism an advantage by giving them a higher chance of survival and reproduction. Darwin called this, "survival of the fittest"
